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Although my name here is NuJinma, That was in 2005 when this tractor was new. I have a Diesel leak out of a port on my fuel injector pump. This is the port with the red arrow in the pic I attached. It flows quite well but does not seem to affect the running of the tractor leading me to think it is a return to tank, and the hose just fell off it. This does not seem to be the case as I looked at the spare YD 380 engine which I have and on this “port” it has a little cover which popped off, i think when the pressure built up. Also the return to tank seems to be a different line. I also have a spare complete injector pump so I can change it, if a major issue but obviously would prefer to fix it. If anyone knows for sure what this port is for or why it is flowing i’d appreciate an answer. Thanks.
22hp diesel, YangDong 380 2005 1200 hrs.
Don’t know why but I cannot seem to upload a jpg that is 647 KB (662,653 bytes)
3rd time lucky! seems to have uploaded this time.
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That is the crankcase/governor sump vent/overflow port.
I would start by completely draining and refilling the pump with fresh engine oil and monitor the overflow port to see if it is still overflowing. When the lift pump (the black housing above and to the right of your arrow) it will leak fuel into the pump crankcase and overflow it. It also dilutes the oil and can cause premature wear.
Take a look at this document starting on page 40 for more information on this.
http://www.harnerfarm.net/Jinma/Files/jinma_manual.pdf
Feel free to download a copy of this manual for your own use.
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Yes, when it fails.
On mine the lift pump was actuated by a push rod that runs on a cam inside the injection pump. The only seal between the IP pump and the fuel in the lift pump was a small o-ring. O-rings work pretty good in a static situation but are not so good in a sliding application like this one. After replacing the o-ring several times I got tired of the whole mess and just replaced the lift pump with an electric one. It was easy enough to make a cover plate and gasket to seal the IP crankcase.
I also found out that the banjo bolt fittings in the fuel line have a nice barbed nipple on the inside. Just cut the compression sleeve off and pull it out. Then it can be installed on a new fuel hose with a regular worm screw clamp. Wired the electric pump to a “hot when on” location and it has worked fine for several years.
To monitor the situation I made a little collection bottle from a clear pop bottle and connected it to the nipple on the overflow vent. As hours have built on the engine it has slowly developed a leak in the IP internally and is still getting fuel in the oil. Since it only takes 4 ounces or so, it is pretty easy to just change the IP sump oil more often. I am coming up on 900 hours on a tractor that was new in 2007 and have to change oil in the IP about every 25 hours.
Eventually the IP will need to be rebuilt or replaced, an expense I am not looking forward to, so frequent oil changes are the order of the day for now… Maybe I should replace the drain plug with a valve just to make it easier.
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